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Add Linux namespace delegation support

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This allows ZFS datasets to be delegated to a user/mount namespace
Within that namespace, only the delegated datasets are visible
Works very similarly to Zones/Jailes on other ZFS OSes

As a user:
```
 $ unshare -Um
 $ zfs list
no datasets available
 $ echo $$
1234
```

As root:
```
 # zfs list
NAME                            ZONED  MOUNTPOINT
containers                      off    /containers
containers/host                 off    /containers/host
containers/host/child           off    /containers/host/child
containers/host/child/gchild    off    /containers/host/child/gchild
containers/unpriv               on     /unpriv
containers/unpriv/child         on     /unpriv/child
containers/unpriv/child/gchild  on     /unpriv/child/gchild

 # zfs zone /proc/1234/ns/user containers/unpriv
```

Back to the user namespace:
```
 $ zfs list
NAME                             USED  AVAIL     REFER  MOUNTPOINT
containers                       129M  47.8G       24K  /containers
containers/unpriv                128M  47.8G       24K  /unpriv
containers/unpriv/child          128M  47.8G      128M  /unpriv/child
```

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Will Andrews <will.andrews@klarasystems.com>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Co-authored-by: Allan Jude <allan@klarasystems.com>
Co-authored-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Sponsored-by: Buddy <https://buddy.works>
Closes #12263
This commit is contained in:
Will Andrews
2021-02-21 10:19:43 -06:00
committed by Brian Behlendorf
parent a1aa8f14c8
commit 4ed5e25074
33 changed files with 1166 additions and 15 deletions
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lib/libspl/os/linux/zone.c
+31 -1
View File
@@ -23,10 +23,40 @@
* Use is subject to license terms.
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <zone.h>
zoneid_t
getzoneid(void)
{
return (GLOBAL_ZONEID);
char path[PATH_MAX];
char buf[128] = { '\0' };
char *cp;
int c = snprintf(path, sizeof (path), "/proc/self/ns/user");
/* This API doesn't have any error checking... */
if (c < 0)
return (0);
ssize_t r = readlink(path, buf, sizeof (buf) - 1);
if (r < 0)
return (0);
cp = strchr(buf, '[');
if (cp == NULL)
return (0);
cp++;
unsigned long n = strtoul(cp, NULL, 10);
if (n == ULONG_MAX && errno == ERANGE)
return (0);
zoneid_t z = (zoneid_t)n;
return (z);
}